include/net/addrconf.h

   1 #ifndef _ADDRCONF_H
   2 #define _ADDRCONF_H
   3
   4 #define MAX_RTR_SOLICITATIONS           3
   5 #define RTR_SOLICITATION_INTERVAL       (4*HZ)
   6
   7 #define MIN_VALID_LIFETIME              (2*3600)        /* 2 hours */
   8
   9 #define TEMP_VALID_LIFETIME             (7*86400)
  10 #define TEMP_PREFERRED_LIFETIME         (86400)
  11 #define REGEN_MAX_RETRY                 (3)
  12 #define MAX_DESYNC_FACTOR               (600)
  13
  14 #define ADDR_CHECK_FREQUENCY            (120*HZ)
  15
  16 #define IPV6_MAX_ADDRESSES              16
  17
  18 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ / 50 : 1)
  19 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
  20 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
  21
  22 #include <linux/in.h>
  23 #include <linux/in6.h>
  24
  25 struct prefix_info {
  26         __u8                    type;
  27         __u8                    length;
  28         __u8                    prefix_len;
  29
  30 #if defined(__BIG_ENDIAN_BITFIELD)
  31         __u8                    onlink : 1,
  32                                 autoconf : 1,
  33                                 reserved : 6;
  34 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  35         __u8                    reserved : 6,
  36                                 autoconf : 1,
  37                                 onlink : 1;
  38 #else
  39 #error "Please fix <asm/byteorder.h>"
  40 #endif
  41         __be32                  valid;
  42         __be32                  prefered;
  43         __be32                  reserved2;
  44
  45         struct in6_addr         prefix;
  46 };
  47
  48
  49 #include <linux/netdevice.h>
  50 #include <net/if_inet6.h>
  51 #include <net/ipv6.h>
  52
  53 #define IN6_ADDR_HSIZE_SHIFT    4
  54 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
  55
  56 int addrconf_init(void);
  57 void addrconf_cleanup(void);
  58
  59 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  60 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  61 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  62
  63 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  64                   const struct net_device *dev, int strict);
  65 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  66                             const struct net_device *dev, int strict,
  67                             u32 banned_flags);
  68
  69 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  70 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  71 #endif
  72
  73 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  74                                    const unsigned int prefix_len,
  75                                    struct net_device *dev);
  76
  77 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  78
  79 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
  80                                      const struct in6_addr *addr,
  81                                      struct net_device *dev, int strict);
  82
  83 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
  84                        const struct in6_addr *daddr, unsigned int srcprefs,
  85                        struct in6_addr *saddr);
  86 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
  87                       u32 banned_flags);
  88 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
  89                     u32 banned_flags);
  90 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2);
  91 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
  92 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
  93
  94 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
  95 {
  96         if (dev->addr_len != ETH_ALEN)
  97                 return -1;
  98         memcpy(eui, dev->dev_addr, 3);
  99         memcpy(eui + 5, dev->dev_addr + 3, 3);
 100
 101         /*
 102          * The zSeries OSA network cards can be shared among various
 103          * OS instances, but the OSA cards have only one MAC address.
 104          * This leads to duplicate address conflicts in conjunction
 105          * with IPv6 if more than one instance uses the same card.
 106          *
 107          * The driver for these cards can deliver a unique 16-bit
 108          * identifier for each instance sharing the same card.  It is
 109          * placed instead of 0xFFFE in the interface identifier.  The
 110          * "u" bit of the interface identifier is not inverted in this
 111          * case.  Hence the resulting interface identifier has local
 112          * scope according to RFC2373.
 113          */
 114         if (dev->dev_id) {
 115                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 116                 eui[4] = dev->dev_id & 0xFF;
 117         } else {
 118                 eui[3] = 0xFF;
 119                 eui[4] = 0xFE;
 120                 eui[0] ^= 2;
 121         }
 122         return 0;
 123 }
 124
 125 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 126                                                    unsigned int unit)
 127 {
 128         if (timeout == 0xffffffff)
 129                 return ~0UL;
 130
 131         /*
 132          * Avoid arithmetic overflow.
 133          * Assuming unit is constant and non-zero, this "if" statement
 134          * will go away on 64bit archs.
 135          */
 136         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 137                 return LONG_MAX / unit;
 138
 139         return timeout;
 140 }
 141
 142 static inline int addrconf_finite_timeout(unsigned long timeout)
 143 {
 144         return ~timeout;
 145 }
 146
 147 /*
 148  *      IPv6 Address Label subsystem (addrlabel.c)
 149  */
 150 int ipv6_addr_label_init(void);
 151 void ipv6_addr_label_cleanup(void);
 152 void ipv6_addr_label_rtnl_register(void);
 153 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 154                     int type, int ifindex);
 155
 156 /*
 157  *      multicast prototypes (mcast.c)
 158  */
 159 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 160                       const struct in6_addr *addr);
 161 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 162                       const struct in6_addr *addr);
 163 void ipv6_sock_mc_close(struct sock *sk);
 164 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 165                     const struct in6_addr *src_addr);
 166
 167 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 168 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 169 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 170 void ipv6_mc_up(struct inet6_dev *idev);
 171 void ipv6_mc_down(struct inet6_dev *idev);
 172 void ipv6_mc_unmap(struct inet6_dev *idev);
 173 void ipv6_mc_remap(struct inet6_dev *idev);
 174 void ipv6_mc_init_dev(struct inet6_dev *idev);
 175 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 176 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 177 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 178
 179 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 180                          const struct in6_addr *src_addr);
 181
 182 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 183
 184 /* A stub used by vxlan module. This is ugly, ideally these
 185  * symbols should be built into the core kernel.
 186  */
 187 struct ipv6_stub {
 188         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 189                                  const struct in6_addr *addr);
 190         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 191                                  const struct in6_addr *addr);
 192         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
 193                                struct dst_entry **dst, struct flowi6 *fl6);
 194         void (*udpv6_encap_enable)(void);
 195         void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
 196                               const struct in6_addr *daddr,
 197                               const struct in6_addr *solicited_addr,
 198                               bool router, bool solicited, bool override, bool inc_opt);
 199         struct neigh_table *nd_tbl;
 200 };
 201 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 202
 203 /*
 204  * identify MLD packets for MLD filter exceptions
 205  */
 206 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 207 {
 208         struct icmp6hdr *hdr;
 209
 210         if (nexthdr != IPPROTO_ICMPV6 ||
 211             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 212                 return false;
 213
 214         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 215
 216         switch (hdr->icmp6_type) {
 217         case ICMPV6_MGM_QUERY:
 218         case ICMPV6_MGM_REPORT:
 219         case ICMPV6_MGM_REDUCTION:
 220         case ICMPV6_MLD2_REPORT:
 221                 return true;
 222         default:
 223                 break;
 224         }
 225         return false;
 226 }
 227
 228 void addrconf_prefix_rcv(struct net_device *dev,
 229                          u8 *opt, int len, bool sllao);
 230
 231 /*
 232  *      anycast prototypes (anycast.c)
 233  */
 234 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 235                       const struct in6_addr *addr);
 236 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 237                       const struct in6_addr *addr);
 238 void ipv6_sock_ac_close(struct sock *sk);
 239
 240 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 241 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 242 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 243 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 244                          const struct in6_addr *addr);
 245 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 246                              const struct in6_addr *addr);
 247
 248 /* Device notifier */
 249 int register_inet6addr_notifier(struct notifier_block *nb);
 250 int unregister_inet6addr_notifier(struct notifier_block *nb);
 251 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 252
 253 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 254                                   struct ipv6_devconf *devconf);
 255
 256 /**
 257  * __in6_dev_get - get inet6_dev pointer from netdevice
 258  * @dev: network device
 259  *
 260  * Caller must hold rcu_read_lock or RTNL, because this function
 261  * does not take a reference on the inet6_dev.
 262  */
 263 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 264 {
 265         return rcu_dereference_rtnl(dev->ip6_ptr);
 266 }
 267
 268 /**
 269  * in6_dev_get - get inet6_dev pointer from netdevice
 270  * @dev: network device
 271  *
 272  * This version can be used in any context, and takes a reference
 273  * on the inet6_dev. Callers must use in6_dev_put() later to
 274  * release this reference.
 275  */
 276 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 277 {
 278         struct inet6_dev *idev;
 279
 280         rcu_read_lock();
 281         idev = rcu_dereference(dev->ip6_ptr);
 282         if (idev)
 283                 atomic_inc(&idev->refcnt);
 284         rcu_read_unlock();
 285         return idev;
 286 }
 287
 288 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 289 {
 290         struct inet6_dev *idev = __in6_dev_get(dev);
 291
 292         return idev ? idev->nd_parms : NULL;
 293 }
 294
 295 void in6_dev_finish_destroy(struct inet6_dev *idev);
 296
 297 static inline void in6_dev_put(struct inet6_dev *idev)
 298 {
 299         if (atomic_dec_and_test(&idev->refcnt))
 300                 in6_dev_finish_destroy(idev);
 301 }
 302
 303 static inline void __in6_dev_put(struct inet6_dev *idev)
 304 {
 305         atomic_dec(&idev->refcnt);
 306 }
 307
 308 static inline void in6_dev_hold(struct inet6_dev *idev)
 309 {
 310         atomic_inc(&idev->refcnt);
 311 }
 312
 313 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 314
 315 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 316 {
 317         if (atomic_dec_and_test(&ifp->refcnt))
 318                 inet6_ifa_finish_destroy(ifp);
 319 }
 320
 321 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 322 {
 323         atomic_dec(&ifp->refcnt);
 324 }
 325
 326 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 327 {
 328         atomic_inc(&ifp->refcnt);
 329 }
 330
 331
 332 /*
 333  *      compute link-local solicited-node multicast address
 334  */
 335
 336 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 337                                              struct in6_addr *solicited)
 338 {
 339         ipv6_addr_set(solicited,
 340                       htonl(0xFF020000), 0,
 341                       htonl(0x1),
 342                       htonl(0xFF000000) | addr->s6_addr32[3]);
 343 }
 344
 345 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 346 {
 347 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 348         __be64 *p = (__be64 *)addr;
 349         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 350 #else
 351         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 352                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 353                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 354 #endif
 355 }
 356
 357 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 358 {
 359 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 360         __be64 *p = (__be64 *)addr;
 361         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 362 #else
 363         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 364                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 365                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 366 #endif
 367 }
 368
 369 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 370 {
 371         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 372 }
 373
 374 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 375 {
 376 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 377         __be64 *p = (__be64 *)addr;
 378         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 379                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 380                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 381 #else
 382         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 383                 addr->s6_addr32[1] |
 384                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 385                 (addr->s6_addr[12] ^ 0xff)) == 0;
 386 #endif
 387 }
 388
 389 #ifdef CONFIG_PROC_FS
 390 int if6_proc_init(void);
 391 void if6_proc_exit(void);
 392 #endif
 393
 394 #endif